This is the sensible, long-term option. Diamine Registrar’s Ink Blue-Black writes onto the page in a composed blue, then gradually oxidises to a permanent black as it bonds with the paper. The effect is quietly reassuring — nothing flashy, just writing that stays exactly where you put it.
Used for generations to record births, deaths and marriages, this is genuine archival-quality fountain pen ink, waterproof once dry and entirely resistant to fading, smudging or second thoughts. Supplied in a generous 100ml refill bottle, it’s ideal if you write often, sign important documents regularly, or simply dislike running out of ink at inconvenient moments.

Why You’ll Love It

• Properly Permanent: Always waterproof and archival once dry, so your writing never fades, runs, or washes away.

• A Living Colour Shift: Writes blue, then oxidises naturally to black for immediate clarity and lasting permanence.

• Made for Regular Use: The 100ml bottle keeps you well supplied without constant refills or replacements.

Specifications That Matter

• Classic waterproof registrar’s ink

• Archival quality, designed for official documents

• Suitable for all fountain pens

• Traditionally used by Registrars and Clergy

• Made in the UK

• Supplied in a 100ml plastic refill bottle

• Packaging may vary slightly from the image shown